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    <script>
        var arr1 = ["kai"];
        var arr2 = ["ke"];
        var arr3 = ["ba"];

        console.log(arr1.concat(arr3));
        console.log(arr1);
        /*
            concat 用于拼接两个或两个以上的数组，并返回一个新数组，并不会改变原有数组的值
        */
    </script>
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